HTTP ERROR 500

Amrita Rana 0 Reputation points
2026-11-13T06:09:04.7266667+00:00

Not able to open outlook due to HTTP ERROR 500. I need to access the office mails

Outlook | Web | Outlook on the web for business | Email
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  1. Dora-T 2,175 Reputation points Independent Advisor
    2026-11-13T06:13:35.85+00:00

    Hi @Amrita Rana

    Based on your description, this issue appears to be related to Microsoft's ongoing service incident (Incident ID: MO1550821), which is affecting connectivity to multiple Microsoft 365 services, including Exchange Online, Microsoft Teams, and SharePoint Online.

    Outlook relies on Exchange Online for its email services, and Microsoft has confirmed that users may be unable to access their mailboxes through Outlook on the web, desktop, or mobile devices. Email delivery may also be delayed.

    According to the latest update, the Microsoft 365 team is continuing to work on improving server stability and restoring normal service. Unfortunately, a confirmed timeline for full service restoration has not yet been provided.

    User's image

    • If you have Microsoft 365 administrator privileges, please sign in to the Microsoft 365 Admin Center using this link to view the details of this issue.
    • If you are an end user: you can check the Microsoft 365 Service Status for the latest service availability updates.

    Please kindly note that this is a user-to-user support forum, and I’m an end user just like you, not a member of the product team. As such, I’m unable to directly influence or expedite the resolution, nor can I provide a confirmed timeline for when the issue will be fully resolved and all services will return to normal. However, please rest assured that the relevant teams are working hard to resolve this issue as soon as possible. 

    Hopefully, Microsoft will restore the affected services soon. Thank you for your patience while Microsoft works to resolve the issue.

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  2. AI answer

    2026-11-13T06:10:05.1033333+00:00

    Open Outlook on the web in an InPrivate or Incognito window first; if it works there, clear the browser’s Outlook/Microsoft 365 cookies and cached data, then sign in again. This isolates a browser-session problem without changing the mailbox. ^1^

    If the HTTP 500 continues

    1. Try another supported browser or device.
      • If Outlook opens, the problem is local to the original browser.
      • Clear cookies and cached files for Microsoft 365/Outlook in that browser, close it completely, and reopen it.
    2. Determine whether other employees are affected.
      • Several users affected: ask a Microsoft 365 administrator to open Microsoft 365 admin center → Health → Service health → Exchange Online.
      • Any active incident or advisory will include its status, affected services, and Microsoft’s updates. Administrators can also select Report an issue when no matching incident appears. ^2^
      • If the administrator cannot sign in, the public Microsoft service-status page is listed in the same documentation.
    3. Only your mailbox is affected: ask the administrator to check your Exchange Online license:
      • Open Microsoft 365 admin center → Users → Active users.
      • Select your account and open Licenses and apps.
      • Confirm that a valid license containing Exchange Online is assigned and enabled.
      • If it is missing, assign it and allow provisioning to complete. Microsoft states that provisioning normally takes under 30 minutes but can sometimes take up to 24 hours. ^3^

    Do not remove a currently valid license merely as a general reset: removing an Exchange Online license can disconnect an ordinary mailbox, and Microsoft documents a 30-day recovery window before permanent deletion in the applicable unlicensed-mailbox scenario. ^4^

    Administrator escalation

    If Service health is clear, the license is valid, and the error remains after the documented provisioning period, an administrator should open:

    Microsoft 365 admin center → Help & support → Contact Support

    Include the approximate failure time, affected username, whether other users are affected, and the full error details shown on the Outlook error page—but remove session IDs, tenant information, and other sensitive identifiers from public posts. Microsoft 365 business support requests require an administrator; subscriptions purchased entirely through a partner should be escalated through that partner. ^5^

    References

    1. how to fix outlook website something went wrong - Microsoft Q&A
    2. How to check Microsoft 365 service health
    3. Delays in provisioning of user/mailbox or synchronizing changes in Exchange Online
    4. Can't access the mailbox of an unlicensed user in Exchange Online
    5. Get support for Microsoft 365 for business
    AI-generated content may be incorrect. Read our transparency notes for more information.

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